Parse the logical structure
"If everyone passes the quiz, Mr. Johnson will play his guitar."
-Use q as a constant to represent the quiz
-Use g as a constant to represent Mr. Johnson's guitar
-Use u as constant to represent Mr. Johnson
-Use $P(w, x)$ as the two-place predicate "w passes x"
-Use $Q(y, z)$ as the two-place predicate "y will play z"
Not sure if I am parsing this correctly This what I have so far, but I feel that I am doing it wrong.
$\forall w(P(w,q))\rightarrow Q(u,g)$
Start by replacing the constants and predicates for words. PS: I also suggest use $v$ for "his guitar".
Next, apply the universal quantifier and express "If ... , (then) ..." as a logical connective.
(edit)
That is correct.